/Engine/Source/Runtime/Messaging/Public/IMessageInterceptor.h
Intercepts a message before it is being passed to the message router.
true if the message was intercepted and should not be routed, false otherwise.
bool InterceptMessage ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IMessageContext](API\Runtime\Messaging\IMessageContext), ESPMode::ThreadSafe > & Context )